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    <script>
        /* instanceof是如何判断的
              *表达式A instanceof B
              *如果B的显示原型对象是在A对象的隐式原型链上，则返回ture,反之
        */
        console.log(Object instanceof Function);
        console.log(Function instanceof Object);
        console.log(Object instanceof Object);
        console.log(Function instanceof Function);
        // 以上全是true
    </script>
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